150 THE IVORY GULL. 



first five quills are black at the end, the first on its outer web also, the fifth 

 with a small white tip, the tips of all the other quills more or less white. 



Length to end of tail 18 inches, to end of wings 20, to end of claws 17; 

 extent of wings 36^; wing from flexure 12; tail 7; bill along the back 1^-, 

 along the edge of lower mandible 2 T 2 g-; tarsus l^l middle toe 1^, its claw 

 T 4 5-. Weight 11 lbs. 



Young bird in January. 



Bill and feet black. Edges of eyelids and iris as in the adult. The hind 

 head and neck are bluish-grey, and before the eye there is a semi-lunar 

 blackish mark, the tips of the auriculars also dark grey. Forehead, sides of 

 the head, throat, and lower parts, white, as is the rump. Tail white, with a 

 broad terminal band of black, the outer feather having only a spot on the 

 inner web. The mantle is bluish-grey, but a broad band of black crosses the 

 lower part of the hind neck, and the larger wing-coverts are of the same 

 colour towards the end. The primary quills are black, more or less mar- 

 gined with white internally. 



Length to end of tail 17 inches, to end of wings 19, to end of claws 17; 

 extent of wings 36 T 3 ^. Weight 14^ oz. 



THE IVORY GULL. 



^-Lartjs eburneus, Grnel. 



PLATE CCCCXLV.— Adult and Young. 



Having ascertained that this beautiful species visits the southern coast of 

 Labrador and Newfoundland every winter, I have thought it probable that it 

 occasionally extends its rambles as far as our eastern shores, and therefore 

 determined to include it in my Illustrations. The figures in the plate were 

 taken from two specimens procured by Captain James Clark Ross, one of 

 which was an adult male, the other a young bird in its second year. Captain 

 Sabine says that the Ivory Gulls are attracted in considerable numbers by 

 whale blubber, are therefore usually found in company with the Procellaria 

 glacialis, and are easily killed, being by no means shy. Dr. Richardson 

 informs us that they were observed breeding in great numbers on the high 

 perforated cliffs which form the extremity of Cape Parry, in latitude 70°. 



